foreach $class (@kids) {

   # inspect each top level (class) array
   # here, $class is a reference to an array, so...

   foreach $student (@$class) {

      # here, $student is a reference to a hash, so...
      print "$student->{'name'}\n";

      # or you can iterate:
      foreach $fact (keys %{$student}) {

         # note that protecting $student with surrounding
         # curly braces will make keys() a lot happier
         # I like to pronounce the construct as:
         # "The hash to which $student refers"
         # and we may now print:

         print "$fact: $student->{$fact}\n";

         # or if you are in a particularly perverse mood, you may say:
         print "$fact: $$student{$fact}\n";
         # if you DO find yourself in that mood though, consider
         # adjusting your meds!  :-)
      }
   }
}